Petroleum Indications around Harrismith. 77 



shale in the underlying Stormberg series. The intrusion of 

 igneous rocks through such shale beds might cause partial dis- 

 tillation of oil. The idea receives some support from the occurrence 

 of oil in the joints of a dyke, mentioned by Mr. Fitz-Henry. 

 On the other hand, the discovery of oil in the Kimberley or 

 Ecca shales, near Bloemfontein, if such a discovery is an undoubted 

 fact, cannot be explained by the presence of oil shales in the more 

 recent Stormberg beds." 



